WHAT IS THE ADVANTAGE ______ DOING THIS

143. - BAI LUYEN TAP VE DANG DANH TU DI VOI GIOI TU HAY CO DAP AN A1562 143. - BAI LUYEN TAP VE DANG DANH TU DI VOI GIOI TU HAY CO DAP AN A1562
BAI LUYEN TAP VE DANG DANH TU DI VOI GIOI TU HAY CO DAP AN A1562

143. What is the advantage ______ doing this?

A. of B. about C. with D. by

II. Fill in the blank with a suitable preposition.